[Qemu-devel] [Bug 721659] Re: qemu-kvm-0.13.0 doesn't pass USB devices to the VM

[Brad Hards]

Hi,

Thanks for reporting this problem.

Can you tell me a bit more about your configuration? For example:
What are the guest and host operating systems?

Is it always "need -1"? Do you ever see "need 1"?

What is the device you're trying to open? Can you show the USB
descriptors (e.g. from lsusb)?

Do you have rights to open the device (e.g. are you running qemu with
elevated privileges)? Does it help / change things if you do or don't?

I'm not sure that the error messages are very accurate in this
particular case. I think the problem with those messages comes from use
of perror() in the QEMU code and that the underlying operations aren't
returning / setting errno in the right way (or perhaps at all). However
the fact that we're even getting to the error path indicates a problem.
If I had to guess, the device is already bound to a driver on the host
and you don't have permissions to unbind it. However I'm pretty fuzzy on
this one, and I'm really hoping the additional information might help
someone else fix it.

Brad

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https://bugs.launchpad.net/bugs/721659

Title:
  qemu-kvm-0.13.0 doesn't pass USB devices to the VM

Status in QEMU:
  New

Bug description:
  I have the bug, similar to this one:
  https://bugzilla.redhat.com/show_bug.cgi?id=583108
  but under gentoo

  When I add parameters -usb -usbdevice host:4348:5584, I see the
  following lines in console:

  husb: config #1 need -1
  USBDEVFS_DISCONNECT: No route to host
  husb: open device 2.11
  (...many repetitions of three above lines...)

  All parameters (2.11) are verified with lsusb at host computer -
  parameters are correct

  Error description is very confusing - I don't know what to check, what
  "config #1" mean, which route should be checked and how to check it.